Machine for trimming shoe parts



Jan. 11, 1949. i E. A. HOLMGREN 2,458,598

MACHINE FOR TRIMMING SHOE PARTS Filed Nov. 21, 1946 2 Sheet s-Sheet 1fizvenfor Eric A .HoZmgrerz B is ey Jan. 11, 1949. E. A. HOLMGREN2,453,598

MACHINE FOR TR IMMING SHOE PARTS Filed Nov. 21, 1946 2 Sheets-Sheet 2fizz/612101" 50 Erz'aAHo/m grew Patented Jan. 11, 1949 UNITED STATESPATENT OFFICE 3 Claims.

This invention relates to machines for trimrning shoe parts and isillustrated herein as embodied in a welt butting and tacking machine ofthe type disclosed in Letters Patent of the United States No. 2,045,577,granted on June 30, 1936, on an application of Benjamin B. Blanchard.

It is an object of the invention to provide machines of theaboveeidentified type with improved. trimming mechanism adapted tosever, with a clean cut, welt materials of all kinds including weltsmade of plastic materials which are notorie 0115 for their toughness andresistance to cutting.

in the accomplishment of this object, the illustrated machine isprovided, in accordance with one feature of the invention, with a weltbutting knife having two motions one being a motion of translationdesigned to carry the knife bodily into and out of operative relation tothe welt to be butted, and the other being a resulting motion of theknife with relation to its carrrier and designed to cause the cuttingedge of the knife to move in the general direction in which it extendsso as to produce a draw cut. More specifically, in the illustratedembodiment of the invention the knife is disk shaped and mounted forrotation with relation to a reciprocating carrier. The reciprocation ofthe carrier serves to move the knife into and out of operative positionwith relation to the welt. There is a link connection between the rotarydisk knife and the stationary machine frame, the link connection beingso con.- structed and arranged that, during and as a result of thereciprocation of the knife carrier, the knife is rotated with relationto the carrier.

These and other features of the invention will now be described indetail in connection with the accompanying drawings and will be pointedout in the appended claims.

In the drawings,

Fig. 1 is a front elevation of a portion of a welt butting and tackingmachine in which the invention is illustrated as embodied;

Fig. 2 is a side elevation of one of the welt butting knives of themachine illustrated in Fig. 1 and associated machine parts;

Fig. 3 is a side elevation (as Viewed from the line IIIIII of Fig. 1) ofa knife operating mechanism, the parts being shown in their startingpositions; and

i 4 i a bottom lan s iewed irm; has

Ill-IV oi g.- 8 of th knife peratihg mecha nism.

T e in en icn is illustrat s mbod ed i s machine of the type disclosedin the above-mentioned patent and also in Unit-ed States Letters PatentNo. 1,709,347, granted on April 16, 1929, on an application of GeorgeGoddu and Fred L. MacKenz ie, and, accordingly, only such features ofthe general organization as it is necessary to refer to for anunderstanding of the invention will be described hereinin detail.

As illustrated in Fig, 1 the machine has two s e up o n memb r 3 a d abash to l2 an ed to ake the ewest the cuttin s o e f w w u ng ni es I 4ar an ed is srats a opposite sides at he su ported hip a e ci t o the. hel b east s.- v the shoe to be operated upon spositioned heights ise. ofthsmashin by a helddewn member lhe we t iF sv2 v a sa h si ea t sho i uq sd or t e b tt n o er t n b a eas finder (Fi 1,) anvil '9 ands We suport 22. These members to ether with the knives i l a air of askin u ts 2re m u in a pair o wi in am s '26 fu crumed i t ma? chine am is s ineahsu e ical e in d ections extending 'widthwis'e of the shoe.

Each welt butting knife Ill-is in the form of a disk of irregular shape,as illustrated best in Fig. has a c r u ar cutt ng e e s men to a hubportionpf the knife about the axis of which the knife may he rotated, aswill be described.

o cause th kn e t se er t e bu end 9 the welt with a draw out ascentrasted with the chop.- ping cut typical of welt butting knives usedhere: tofore in a hi of the l ust ated t e, ea h knif is of e i l trated.m sh he ha a mo e ment of translation, as usual, but in additionthereto has a concomitant movement of retaw tisn- T0 om li h thi thsllswins mesh nism for supporting and operating the knife i4 is ov e i hme u de od that t e i l-usate m chi e s e u pp d ith wo such ni s p o ta d o ating me h nisms d that a descripti n I o y 9 s f them w lluflise- As in the machines disclosed in the .above-m-e ntioned patents,there is provided a main slide 28 (Figs 3 an s fer suppsr ins a d acatinth we t b i g nife: Moun e on the main s de 28 for me t th r lat sh.thereto. a d at an an e to t di e t on o -movement of that slide is aknife carrying slide 30 the forward end of c is o ded at it lswer qrenwith a era l sxtehslie flange Fish,- Cut o h b om has cf the erwars19i the knife arry ng sl de .39 z hel iihs the. f an e his a e s 34 llttra sd has In Fisa t e recesshe hs The h l sea 0 v covered or bridgedover by a bottom plate 36 secured by screws to the bottom face of theforward end of the slide 30. The bottom plate 35 has a bore toaccommodate the hub of the knife I4, the hub abutting the lower face ofone end portion of a link 38 located in the recess 34 and provided witha bore in alinement with the bore in the bottom plate 36 and a bore inthe upper portion of the flange 32 above the recess 34.

The hub of the knife I4 is hollow and the knife I4 is countersunk inalinement with the hollow hub to accommodate a clamping screw 48 whichpasses through the hub of the knife I4, the bores in the bottom plate36, the link 38 and the upper portion of the flange 32, thus mountingthe knife in place, the knife being held in clamped position by alocknut 42 threaded on the end portion of the clamping screw 40extending upwardly from the upper face of the flange 32. Thus the knifeI4 and the link 38 are rigidly clamped together by the screw 48' andlocknut 42, the head of the screw resting in the countersunk portion ofthe knife. As will be presently described, the link 38 may be rotated,thus causing a rotation of the knife I4 with relation to its carrierslide 30. To this end, the extremity of the link 38 remote from that towhich the knife is clamped is apertured to surround a vertical stem 44(Figs. 1 and 4) held in a yoke shaped arm 46 pivotally secured to abracket 48 fixed K in a casting 50 which is part of the machine frame.Thus the link 38, by sliding on the stem 44, can participate in thevertical movements of the knife I4, to be described, and can swing aboutthe axis of the stem 44.

Referring more specifically to the knife carrying slide 30 and itsmovement with relation to the main slide 28, it will be noted that, asin the machines disclosed in the above mentioned patents, the main slideis provided with an inclined guideway 52 (Fig. 3) along which the knifecarrying slide 30 is movable with relation to the slide 28. On movementof the knife carrying slide 30 with relation to the slide 28 the knifeI4 is moved heightwise of the machine to carry it into the plane of itscutting operation or to move it out of that plane at the end of acutting operation. To this end, the slide 38 has a lug 54 (Fig. 3) whichis pivotally connected by means of a link 56 to a rotary member 58secured to a shaft 50 mounted for rotation in the machine frame andprovided with a brake mechanism (not shown here but disclosed in saidpatents. The brake mechanism tends to resist rotation of the shaft 60and thus tends to resist movement of the slide 30 on movement of theslide 28. As illustrated in Fig. 3, the slide 30 is provided with anabutment 62 adapted to cooperate with a stop 64 provided on the slide28. Moreover, the slide 28 carries a stop screw 66 the head portion ofwhich extends into a slot 68 provided in the slide 38. As fullydisclosed in the above-mentioned patents the illustrated machine isprovided with mechanism for reciprocating the slide 28 in the machineframe.

As a result of the just described arrangement and on movement of theslide 28 in the direction of the arrow illustrated in Fig. 4, movementof the slide 30 with and in the same direction as the slide 28 isresisted by the described connection of the slide 30 with the shaft 68.As a result, the knife carrying slide 30 is lowered substantiallyvertically along the guideway 52, and thus the knife I4 is lowered intothe plane of its cutting operation, this movement of the knife beingpermitted by the link 38 sliding down on the stem 44. As soon as theabutment 62 engages the stop 64 the downward movement of the slide 30ceases, the slide 30 then being moved along with the slide 28 andovercoming the resistance of the brake mechanism acting on the shaft 68.Thus, the knife I4 is moved in its plane of operation toward thesupported welt and the anvil 20 with which the knife I4 cooperates inskiving off the rear end of the welt. By reason of the fact that theknife I4 is clamped to the link 38 which in turn is pivotally secured bymeans of the yoke shaped arm 46 to the fixed bracket 48, the knife I4,as a result of and during the just described movement of translation, isrotated about the center of its hub while the link 38 is swung from theposition indicated in full lines in Fig. 4 to the phantom positionindicated in the same figure. Accordingly, there is imparted to theknife, in addition to its motion of translation, a separate motion ofrotation as a resut of which the cutting edge of the knife is moved, soto speak, in the direction in which it extends. Therefore, when theknife engages the welt w (Fig. 2) the welt is severed by a draw out inthat the knife I4 when being moved across the end of the welt isrotated. Reverse movement of the main slide 28 at the end of the weltbutting operation causes at first a relative movement between the slides28 and 38 in that the slide 38 is merely raised along the guideway 52since its movement with the slide 28 is again resisted by reason of theconnection of the slide 38 to the shaft 60. The upward movement of theslide 38 ends when the screw 56 abuts one end of the slot 68, the knifeagain having been raised to its inoperative upper position. Continuedmovement of the main slide 28 toward the right of Figs. 3 and 4 thenproduces movement of the knife carrying slide 30 in the same directionas a result of which the link 38 and the knife I4 are again returned totheir initial positions illustrated in Fig, 4. It will be seentherefore, that the knife has a four-way motion and that during itshorizontal travel it is rotated about its own axis of rotation with theresults described.

As illustrated best in Fig. 2 and as fully disclosed in theabove-mentioned patents the knife carrying slide 30 is provided with apresser foot I0 mounted on a stem I2 movable in a passageway provided inthe slide 38. The presser foot I8 is adapted to engage the work justahead of the knife and to cooperate with the knife during its cuttingoperation in a manner well known in the art.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent of the United States is:

1. In a machine for operating on shoe parts, a fixed frame, a trimmingknife, a movable carrier on which the knife is mounted for movement withrelation thereto, means for actuating the carrier to impart to the knifea motion of translation along a predetermined path, and means connectingthe knife to the frame and active as a result of the movement oftranslation of the knife to cause the knife to move with relation to thecarrier without deviating from said predetermined path.

2. In a machine for operating on shoe parts, a fixed frame, a trimmingknife, a reciprocating carrier on which the knife is mounted forrotation with relation thereto, means for reciprocating the carrier tomove the knife bodily along a predetermined path, and means connectingthe s knife to the frame and adapted to rotate the knife onreciprocation of the carrier.

3. In a machine for operating on shoe parts, a fixed frame, a diskshaped trimming knife having a rotary hub, a reciprocating carrier onwhich the knife is mounted for rotation with relation thereto, means forreciprocating the carrier to move the knife bodily along a predeterminedpath, and a link connection between the hub of the knife and the frame,the connection being active as a result of the reciprocation of thecarrier to rotate the knife while it moves along said predeterminedpath.

ERIC A. HOLMGREN.

REFERENCES CITED The following references are of record in th file ofthis patent:

UNITED STATES PATENTS

